Electrode



Patented July 23, 1929.

WILLIAM IRBY, or

LYNN, MASSACHUSETTS, ASSIGNOR 'ro GENERAL ELECTRIC com- PM, A conrormrrou on NEW YORK. 1 r

ELECTRODE No Drawing.

My invention relates to electrodes for are lamps, and more particularly to electrodes especially adapted for use in connection with the so-called luminous arc.

5 One of the objects of my invention is to.

provide an electrode of the ilmenite magnetite class, the operation of which is materially improved.

Flaming arc electrodes are commonly made of a mixture of ilmenite, magnetite and chromite, together with a flux of sodium fluoride. I have found that the operation of such electrodes can be very materially improved by substituting the following mixture:

Percent.

Ilmenite (39. O

Magnetite 14. 92 Chromite 3.0 Ferro-titanium 12. 8

Sodium fluoride 0.28

Applicationfiled January 7, 1927. Serial No. 159, 741.

cure by Letters Patent of the UnitedStates,

An electrode for an electric arc consisting of the following ingredients, in substantially the following proportions 'ilmenite 69.0%, chromite 3.0%, magnetite 14.92%,

sodium fluoride 0.28% and ferro-titanium 12.8%.- I

In witness whereof, I have hereunto set WIL IAM IRBY.

'my hand this 5th day of January, 1927. 

